topic Re: Field Maps allowing multipart geometry? in ArcGIS Field Maps Questions

Field Maps allowing multipart geometry?

DougBrowning — Tue, 28 Jun 2022 17:19:46 GMT

I have posted on this in the past but never got an answer. I always assumed multipart support is long gone. But today I had a user that managed to create a polygon with 3 distinct, not connected, parts. I have been trying to recreate it but I cannot. I do however seem to be able to create multipart something according to Pro.

If a use a combo of adding points manually and streaming I can make some crazy shapes. It seems to let me do anything.

Looking at this shape in Pro it has 5 "Parts" listed. Not sure where it is getting this?

Actually designed this project to simulate multipart since I thought it was not supported. I posted a few times on it and never got a response. I personally do not want to use multipart since the long term storage and calculations can be a nightmare. I have dug in the help a few times and see no mention of it.

Would love to hear any ideas. Still not sure how the user got 3 in there. They were using streaming in Field Maps.

Thanks

Re: Field Maps allowing multipart geometry?

DamianSmith — Fri, 24 Mar 2023 19:40:34 GMT

I could really use multi-part support in field maps. I use it for mapping prescribed fire and wildfires. The ability to capture what actually burned as a single polygon feature would be very useful

Re: Field Maps allowing multipart geometry?

DougBrowning — Mon, 15 Apr 2024 14:12:09 GMT

Bump to see what has changed or any info 2 years later. thanks

Re: Field Maps allowing multipart geometry?

ClimateTeam — Fri, 28 Jun 2024 20:56:34 GMT

I would also be interested in multipart functionality

Re: Field Maps allowing multipart geometry?

LucaTD — Mon, 01 Sep 2025 09:33:49 GMT

Had the same issue happening recently. A user managed to split an existing feature in two. No idea how this happened, any luck uncovering the truth in the last year?

Re: Field Maps allowing multipart geometry?

DougBrowning — Tue, 02 Sep 2025 13:08:23 GMT

I think a lot of mine tracked to a user appending in an old shapefile. Not positive still. Have not heard from Esri yet.

Re: Field Maps allowing multipart geometry?

LucaTD — Wed, 03 Sep 2025 07:34:43 GMT

Mine is a mystery as of now, users have no options but adding or removing vertices, bit more advanced options such as copy feature or delete all vertices are not enabled.

We tried by using the streaming functionality and didn't work (thankfully I'd say). Since ours is an offline workflow, we tried to edit the same feature at the same time (both with the same user on two different devices or two different users on two different devices) and sync back at the same time but one overwrites the other.

One last thing I'm gonna try is to see if the issue is only Android-tablet related (the device they are using), as I could test it only on iOS phone and now got hold of an Android tablet.

Worst part is that since it was a test, our contact doesn't know who they assigned the user to, so we can't even track down and ask directly to the source.

Re: Field Maps allowing multipart geometry?

LucaTD — Thu, 04 Sep 2025 09:21:55 GMT

Finally found an answer! Basically what happened in my case is a simple editing of the vertices:

The polygon is first edited in a way that creates self-intersections
Even if there are no vertices on the intersection, the system (FieldMaps but also tested in Map Viewer on browser) will create a vertex upon update/submission (see second picture, those vertices didn't exist before self-intersection)
Then, the user re-select the feature for further editing and add/deletes some vertices (in this case the ones of the "middle" triangle)...and there it is, a multipart polygon! (third picture)

This works both online and offline as they can keep editing features indefinetely!